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Narrative
Balloons with methane and methane plus oxygen differ in density. The balloon containing methane is ignited. The reaction is repeated in the dark. Now, the balloon containing methane plus oxygen is ignited.

Discussion
A balloon containing methane is less dense than air. A second balloon containing approximately equal volumes of methane and oxygen is more dense than air. Each balloon is ignited, first in the light then in the dark. The methane and oxygen balloon explodes with greater violence due to a more nearly stoichiometric mixture of reactants.
CH₄(g) + 2 O₂(g) ---> CO₂(g) + 2 H₂O(g) +803 kJ/mol